Dredging device



DREDGING DEVICE Filed Dec. 4, 1944 5 Sheets-Sheet 1 Inventor 4 a)WHO/@762 I WWW 152% 'NOV. 26, 1946 c w HOLLAND 2,411,685

DREDGING DEVICE Filed Dec. 4, 1944 5 Sheets-Sheet 2 J Uar/ Wzyo/kz/mfInventor Nov. 26, 1946. c, w, HOLLAND DREDGING DEVICE Filed Dec. 4, 19443 Sheets-Sheet 5 Inventor 'thevbrakes in applied, position I PatentedNov. 26,1946

DREDGING DEVICE I 7 Carl Holland; Seattle, Wash. I Application December4, 1944, Serial No. 566,586

or like gearings betweenthe-buckets and a shaft rotated by the cable areeliminated.

A further object of the present invention is to provide brakes adaptedto automatically grip the cable andretainthe receiver in receiving ordumping position when slack is provided in the cable bythe devicestriking the bed of the river, orthe like. c

v A further object 'of the invention is to generally improve andsimplify'the construction of dredging devices of the above kind. 7 Thepresent invention consists in the my form, combination and/arrangementof parts hereinafter more fully described, shownin the accompanyingdrawings andtclaimed.

In the drawings, wherein like reference characters indicatecorresponding parts throughout theseveral views: Figure 1 is a sideelevational view,partly broken awayand in section, of a dredging deviceconstructed in accordance with the present invention' c t a V F ure 2 isa substantiallypentral vertical section taken on line 22 of Figure 1.,,

5 Claims. (01. 37-189) ings provided in the interm ,TFigure 3 is afragmentary vertical transverse section takenfon line 3-33 of Figure 2.v r T Figure 4 is a" fragmentaryflview showing one ;of

Figure 5 is a diagrammatic view sowing the cable, guides ja'nd'pulleys,and manner in whichthe device is operated," ,7

Referring in detail 'to the drawings, the present 7 dredging deviceincludesa cylindrical receiver 5 having an opening 6 in its peripheralwall. The receiver 5 has an axial horizontaljsh'aft 11 whose projectingends are journalecl .in the legs of an inverted U shaped frame 8.,,Discs 9 are frictionally rotatably. mounted onthe shaft 'lbetwee'n theends of the "receiver S and thellegs of frame 8;.and these discscarry acircular series of buckets'IIl arranged near 'andjrotatable aboutthereceiver 5. Pulleys II are fixedto the outer sides of the -discs 9,andguide pulleys I I2 are mounted illustrating the 2 A r ediate portion offrame 8 inwardly of the pulleys I2, and the pulleys I2 are of the doubletype. A cable Mextends from a distant winding drum I5, as shown inFigure 5,

. and around 'aguide pulley I6, then under one pulley I3; laterally tothe adjacent side of frame 8. and over a pulley I2, then downwardly andaround the pulley II at the adjacent side of the frame, then upwardlyover the-mentioned pulley I2, then to the opposite side of the frame 8and over the other pulley I2, then downwardly= and around the otherpulley I I, then upwardly over thesecond named pulley I2, then under theother pulley I3 and over another guide pulley 1 Ilia to a second windingdrum I511; The guide pulleys I6 and I6a may be carried by the boomof'the dredge, and it will .thusbe seen that the cable I4 serves-both asa suspension cable for the dredging device and a driving cable for thebuckets. As the cable I4 passes around the pulleys I I, the buckets, aredirectly. driven thereby so as to eliminate any sprocketgearings betweenthe buckets and a. counter, shaft. driven. by the. suspension cable. pStop members I! are secured to the outerfsides of the legs of frame8above. and below theshaft I and'to one side of the axis-of the latter.Fixed to and rotatable with the shaft I are arms I8 re.- spectivelyengagea-ble with the stop members I! that are located above the shaft.1. when the receiver is in receiving position with its opening 6 at thetop, as shownin Figure l, and with the stop members I! which are belowthe shaft- 1 Whenlthefreceiver is disposed in dumping position with itscopening fi at the bottom, as shown inFigure'3.

Thearrangement is such that whenthe cable is wound on'the drum l5a andsimultaneously unwound'f from drum .'I 5, t the pulleys "II will'bedriven in adirection to cause counterclockwise. rotation of, thebuckets, as viewed in Figures 1 and 3. When this takes place, the receivertisrotated to the receiving position of Figure 1 duetov the frictionalengagementof discs 9 andpull'eys I I with shaft, I, the receiver beingstopped in SuchQreCeiVing positionfby'engagement of the armsjlll'withthe upperstops IL' Upon continued rotation of theibuckets, they willscoop the mal the 'receiver is effected-by rotating the 'bucketsfin onand disposed at the inner, sides of the legs of frame 8 above thepulleys II and buckets I0.

Further guide pulleys I3 are'journaled in openaclockwi'se direction,asview'ed in Figures 1 and 3,

at which time the cable I4 is wound on drum I5 7 and unwound from drumI5a, thereby reversing the direction of travel of the cable. Due to thefrictional engagement between the discs 9 and pulleys l I with shaft 1,this rotation of the buckets will be transmitted to the receiver untilthe latter moves from the receiving position of Figure l to the sumpingposition of Figure 3. In the dumping position, the opening 6 is locatedat the bottom of the device and the material freely flows by gravityfrom the receiver 5 through the opening 6 of the receiver. t

A pair of spring-applied, substantially C-shaped brakes i9 are pivotedin the frame 8 outwardly of the pulleys i3, and disposed between theupper arms of these brakes is a block 20 carried bythe frame 8. The runsof the cable I4 pass between opposite sides of the block 29 and theupper arms of the brakes l9, and the lower. arms of said,v

brakes carry rollers 2| which bear upon the cable I4 at points betweenthe. rollers l2 and lit. The

arrangement is such that when the cable I4 is placed ina tautconolitiori, it will rock the brakes l9 against the action of theiractuating springs 22 so as to release the upper arms of the brakes 19from the cable. On the-other hand, when slack is presented in thecableld, the springs 22 will rockthe brakes E9- in a direction to causetheir upper-ends to bind the cable l5 against opposite sides of theblock 25 and retain the cable in engagement with the pulleys H. Thus,movement of the cable and rotation of the buckets and receiver isprevented whenslack is provided in the cable, thereby insuring retentionof the receiver inreceiving or dumping position until such'slack isremoved from the cable. This is'desirable when the'slack is caused bythe dredging device striking the bed of the river or the like. It willbe noted that as soon as the windingof cable M begins, the slack isremoved from the cable and the brakes are released so as topermit'driving 0f the buckets.

From the foregoing description, it' is believed that the constructionand operation, as well as the advantages of the present invention;willbe readily understood and appreciated by those skilled in the art.Minor changes maybe made in details of construction illustrated anddescribed,;such as fairly falliwithin the spirit and scope'of theinvention as claimed.

WhatI claim is: j 1'. A dredging devicecomprising a cylindrical receiverhaving a horizontal axial shaft provided withprojecting ends, a" framein whichthe ends of said shaft arejournal'ed, said receiver-furtherhaving an opening in its periphery, discs'provided with pulleys androtatable on but having frictional engagement with the shaft,"bucketscarried by said discs'and revoluble 'aboutand substantially'in contactwith the periphery of the receivenjmeans'tosuspend the device andrevolve the buckets in either direction including a single cable passingaround said pulleys, and stop 'means limiting rotary movement of thereceiver to positionswherein the opening is uppermost and lowermost,respectively.

2. A'dredging device comprising a cylindrical receiver having an opening'inits periphery, a bucket unit including rigidly connected bucketsrevoluble about and substantially in'contactwith the periphery oftheireceiver, pulleys fixed to the ends ofthe bucket unit and'operabletogrevolve the latter, said pulleys being coaxial with thereceiver and thejbucketjunit, said buckets .tact. with the periphery ofthe receiver, pulleys connected to the buckets and operable to revolvethe latter, said buckets being open at the side next. to the receivenasupport for the receiver permitting its free oscillation about its axis,suspension means for the device including a cable passing about saidpulleys for revolving the buckets in either direction and by frictionalengagement tending to rotate the receiver in like directions, stop;means limiting rotary movement of the-receiver to positions wherein theopening is uppermost and lowermost, respectively,

and spring-applied brakes for preventing the provision of undue slack inthose portions of the cable passing around the'pulleys when the cable isprovided with slack directly above said support, said brakes beingassociated with said cable so as to be released by the latter when saidcable is placed in a taut condition.

4. A dredging device comprising a, cylindrical receiver having anopening in its periphery and provided with a horizontal axial shaft, aframe in which said shaft is journaled, discs provided with pulleys and,rotatable on and'having frictional engagement with said shaft; bucketscarried by said discs and revoluble about and substantially in contactwith the periphery of the receiver, said buckets being open; at the sidenext to the receiver, a suspension cable for the device passing aroundsaid pulleys for revolving the buckets in either directionand by thefrictional engagement of the discs with the shaft tending to rotate thereceiver in like directions, and stop means limiting rotary movement. ofthereceiver to positions wherein the opening is uppermost and lowermost,respectively,

5. A dredging device comprising a cylindrical receiver having an openingin its peripheryand provided with ahorizontal'axialshaft, a frame inwhich said shaft isfjournaled, discs'provided with pulleys and rotatableon andfhaving'frictional engagement. with said shaft, buckets carriedbysaid discs'and revolublej about "and substantially in-contact with theperiphery. of the receiver, said buckets being open at the side nexttothereceiver, a suspension cable for, the device passing around saidpulleys for' revolving the buckets in either direction and by thefrictional engage,- me'nt'of the discs with the shaft tendingto rotatethe receiver in like directions, and stop I means limiting rotarymovement of the receiver to positions whereinthe opening is uppermostand lowermost, respectively, said stop means including stop membersfixed to the frame. above and below the shaft and arms carried byflandrotatable with the shaft and alternately engag'eable with the stopmemberspabove and below "the shaft.v

CABLIWQHOILANDJ

